He could comfortably put a layer or two underneath. Approximated measures are as follows. Believed to be a size medium perhaps a 36 to 38. Across top of shoulder backside is 18.5 inches.
Across midback is 19 inches. Top of shoulder to wrist seam is 25.5 inches. Armpit to wrist is 18 insches.Zipped and measured across the front. Mid chest is 18 inches. Bottom hem of leather is 18 (allowing for 36 inch waist). Metal zippered front pockets and snap pocket. Inside slide pocket on each side. Heavy metal zippers are fully functional. I loved this jacket, cared for it myself. Best suited for size medium man. Sure to please and could be used for a man or woman. As casual or bike wear. Wear as street clothes or look good on your next bike trip. This item is made of leather and genuine leather, vintage leather, nylon taffetta, nylon lining, sweater hem.